Nonequilibrium nuclear spin distribution function in quantum dots subject to periodic pulses

Electron spin dephasing in a singly charged semiconductor quantum dot can partially be suppressed by periodic laser pulsing. We propose a semiclassical approach describing the decoherence of the electron spin polarization governed by the hyperfine interaction with the nuclear spins as well as the pr...

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Bibliographic Details
Published in:Physical review. B 2017-11, Vol.96 (20), Article 205419
Main Authors: Jäschke, Natalie, Fischer, Andreas, Evers, Eiko, Belykh, Vasilii V., Greilich, Alex, Bayer, Manfred, Anders, Frithjof B.
Format: Article
Language:English
Subjects:
Computer simulation
Distribution functions
Electron spin
Electrons
Magnetic resonance
Nuclear spin
Photon absorption
Polarization (spin alignment)
Quantum dots
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Summary:Electron spin dephasing in a singly charged semiconductor quantum dot can partially be suppressed by periodic laser pulsing. We propose a semiclassical approach describing the decoherence of the electron spin polarization governed by the hyperfine interaction with the nuclear spins as well as the probabilistic nature of the photon absorption. We use the steady-state Floquet condition to analytically derive two subclasses of resonance conditions excellently predicting the peak locations in the part of the Overhauser field distribution which is projected in the direction of the external magnetic field. As a consequence of the periodic pulsing, a nonequilibrium distribution develops as a function of time. The numerical simulation of the coupled dynamics reveals the influence of the hyperfine coupling constant distribution onto the evolution of the electron spin polarization before the next laser pulse. Experimental indications are provided for both subclasses of resonance conditions.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.96.205419